How to tell which type of object i want to use

Question

I am getting this json via ajax:

[{"currency_value":"1.00","currency_code":"47","type":"BUY"},{"currency_value":"1.00","currency_code":"47","type":"SELL"}]

However i want to use only the one who has the type of "SELL"

 var setcurrencyvalue = function(to, value) {
    parseInt($(to).attr('value', value)); // set the currency val
    calculatetotal();
    $('.amount-remaining').val(0);
    //set the amount
}

var showcurval = function(cur_code) {
    var $curcode = '';
    var $currency = $('.currency-czk');
    $.ajax({
       type: 'GET',
       url:  '/transactions/get_currency_val?cur_code=' + cur_code,
       success: function(data) {
           var obj = JSON.parse(data);
           $.each(obj, function (k, v) {
             //  console.log(v);
               switch (v.currency_code) {
                   case '47':
                       $curcode = '€'; // 1
                       setcurrencyvalue($currency, v.currency_value);
                       break;
                   case '33':
                       $curcode = 'Kč'; // CZK/EUR
                       setcurrencyvalue($currency, v.currency_value);
                       break;
                   case '131':
                       $curcode = '₽'; //CZK/RUB
                       setcurrencyvalue($currency, v.currency_value);
                       break;
                   case '144':
                       $curcode = '$'; //CZK/USD
                       setcurrencyvalue($currency, v.currency_value);
                       break;
                   case '168':
                       alert('Please set a currency!');
                       break;
               }

           });

       }
    });
}

This will give me the the v.currency_value randomly there are two of them. how to tell Ajax to work only with "SELL" or "BUY"?

If this is an ajax issue you need to check up the api, we don't know what that is. Otherwise it's your code at fault. — simonzack, Nov 26 '15 at 15:45

score 1 · Answer 1 · answered Nov 26 '15 at 15:45

You can filter the data you get per AJAX.

var obj = JSON.parse(data);
var sells = obj.filter(function(a) {
    return a.type === "SELL";
});

This will return new array only with the objects that have the value SELL in their attribute type.

Here is also a link to the array method filter:

https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

Andy · Answer 2 · 2015-11-26T16:00:44.623

Just filter the data when it's returned:

var obj = JSON.parse(data).filter(function (el) {
  return el.type === 'SELL';
})[0]; // { currency_value: "1.00", currency_code: "47", type: "SELL" }

filter returns an array. The [0] returns the first element of the array. Leave it off if you have more than one object with type: 'SELL' that you need to be returned.

If you wanted to have a generalised function to get objects by type from the data it might look like this:

function getDataByType(data, type) {
    return data.filter(function (el) {
        return el.type === type;
    });
}

var arr = getDataByType(data, 'SELL');

DEMO

score 1 · Answer 3 · edited May 23 '17 at 12:08

1

You could filter the resulting array just after having parsed it. Basically its about using the filter prototype:

obj.filter(function (el) {
     return el.type === "SELL"
});

As a result you get a new array which only contains the elements that pass the filter-function.

For more information on filtering JS-Arrays see this one:

Javascript: How to filter object array based on attributes?

Cheers, Kristof

edited May 23 '17 at 12:08

Community

1
1

answered Nov 26 '15 at 15:50

K. Berger

361
1
9

You should probably call `obj` `arr` instead to save confusion. – Andy Nov 26 '15 at 15:51
This is the original name of the OP :-) – K. Berger Nov 26 '15 at 15:53

score 0 · Answer 4 · answered Nov 26 '15 at 16:05

You can have a if condition like this

 $.ajax({
   type: 'GET',
   url:  '/transactions/get_currency_val?cur_code=' + cur_code,
   success: function(data) {
       var obj = JSON.parse(data);
       $.each(obj, function (k, v) {
         //  console.log(v);
         if(v.type == "SELL"){
           switch (v.currency_code) {
               case '47':
                   $curcode = '€'; // 1
                   setcurrencyvalue($currency, v.currency_value);
                   break;
               case '33':
                   $curcode = 'Kč'; // CZK/EUR
                   setcurrencyvalue($currency, v.currency_value);
                   break;
               case '131':
                   $curcode = '₽'; //CZK/RUB
                   setcurrencyvalue($currency, v.currency_value);
                   break;
               case '144':
                   $curcode = '$'; //CZK/USD
                   setcurrencyvalue($currency, v.currency_value);
                   break;
               case '168':
                   alert('Please set a currency!');
                   break;
           }
         }
       });

   }
});

How to tell which type of object i want to use

4 Answers4